Please read my entire comment before sending me to the excellent Youtube on connecting to Airport using a TCP/IP address for the printer. I also know of the instructions for setting up the printer via TCP/IP which are written on a couple of different web sites.
Lenovo PC. Originally Windows 7. First tried Bonjour to connect to Apple Airport and a Canon printer connected to Airport via USB. Did not work. Found the Youtube video which teaches how to connect via the Default Gateway setting using the TCP/IP setting and Network printer single USB port (sorry, I am paraphrasing the instructions from the Youtube ). That worked. Used the Canon to print via the Apple Airport for several years.
Took advantage of the free Win 10 upgrade. No printer issues. Win 10 was happy to use the installed printer driver and continued to connect through the Airport. This lasted for about 3 months.
Hard drive crash and unfortunately a clean install of Win 10. Lost all programs but kept document files. Have not been able to reconnect to the printer. I've followed the steps of Youtube video referenced earlier. Does not work. I've changed the "LDP" settings. No effect. I had an IT professional have a go at it, no success. Reloaded Bonjour. Nope (but Bonjour clearly sees the network identifying the router by name).
I am open to suggestion. Thank you.